; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes='loop(indvars,loop-deletion)' -S %s | FileCheck %s

; Make sure indvarsimplify properly forgets the exit value %p.2.lcssa phi after
; modifying it. Loop deletion is required to show the incorrect use of the cached
; SCEV value.

define void @test(i1 %c) {
; CHECK-LABEL: @test(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[HEADER_1:%.*]]
; CHECK:       header.1.loopexit:
; CHECK-NEXT:    br label [[HEADER_1_BACKEDGE:%.*]]
; CHECK:       header.1:
; CHECK-NEXT:    br label [[HEADER_2:%.*]]
; CHECK:       header.2:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LATCH_1:%.*]], label [[LATCH_2:%.*]]
; CHECK:       latch.1:
; CHECK-NEXT:    br label [[HEADER_1_LOOPEXIT:%.*]]
; CHECK:       latch.2:
; CHECK-NEXT:    br label [[HEADER_1_BACKEDGE]]
; CHECK:       header.1.backedge:
; CHECK-NEXT:    br label [[HEADER_1]]
;
entry:
  br label %header.1

header.1:
  %p.1 = phi i32 [ 0, %entry ], [ %p.2.lcssa, %latch.2 ], [ 0, %latch.1 ]
  br label %header.2

header.2:
  %p.2 = phi i32 [ %p.1, %header.1 ], [ %p.2.next, %latch.1 ]
  br i1 %c, label %latch.1, label %latch.2

latch.1:
  %p.2.next = add i32 %p.2, 1
  br i1 false, label %header.2, label %header.1

latch.2:
  %p.2.lcssa = phi i32 [ %p.2, %header.2 ]
  br label %header.1
}

define i8 @test_pr52023(i1 %c.1, i1 %c.2) {
; CHECK-LABEL: @test_pr52023(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP_1:%.*]]
; CHECK:       loop.1:
; CHECK-NEXT:    [[INC79:%.*]] = phi i8 [ [[TMP0:%.*]], [[LOOP_1_LATCH:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[TMP0]] = add i8 [[INC79]], 1
; CHECK-NEXT:    br label [[LOOP_2:%.*]]
; CHECK:       loop.2:
; CHECK-NEXT:    br i1 [[C_1:%.*]], label [[LOOP_2_LATCH:%.*]], label [[LOOP_1_LATCH]]
; CHECK:       loop.2.latch:
; CHECK-NEXT:    br label [[LOOP_1_LATCH]]
; CHECK:       loop.1.latch:
; CHECK-NEXT:    br i1 [[C_2:%.*]], label [[EXIT:%.*]], label [[LOOP_1]]
; CHECK:       exit:
; CHECK-NEXT:    [[INC_LCSSA_LCSSA:%.*]] = phi i8 [ [[TMP0]], [[LOOP_1_LATCH]] ]
; CHECK-NEXT:    ret i8 [[INC_LCSSA_LCSSA]]
;
entry:
  br label %loop.1

loop.1:
  %inc79 = phi i8 [ %inc.lcssa, %loop.1.latch ], [ 0, %entry ]
  br label %loop.2

loop.2:
  %inc6 = phi i8 [ %inc79, %loop.1 ], [ %inc, %loop.2.latch ]
  %inc = add i8 %inc6, 1
  br i1 %c.1, label %loop.2.latch , label %loop.1.latch

loop.2.latch:
  br i1 false, label %loop.2, label %loop.1.latch

loop.1.latch:
  %inc.lcssa = phi i8 [ %inc, %loop.2.latch ], [ undef, %loop.2 ]
  br i1 %c.2, label %exit, label %loop.1

exit:
  %inc.lcssa.lcssa = phi i8 [ %inc.lcssa, %loop.1.latch ]
  ret i8 %inc.lcssa.lcssa
}